Revert "Prevent alias from pointing to weak aliases."

This reverts commit r204781.

I will follow up to with msan folks to see what is what they
were trying to do with aliases to weak aliases.

llvm-svn: 204784
diff --git a/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp b/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp
index 9d215ec..4b2f012 100644
--- a/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/llvm/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -688,7 +688,7 @@
     return TheJIT->getOrEmitGlobalVariable(GV);
 
   if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
-    return TheJIT->getPointerToGlobal(GA->getAliasedGlobal());
+    return TheJIT->getPointerToGlobal(GA->resolveAliasedGlobal(false));
 
   // If we have already compiled the function, return a pointer to its body.
   Function *F = cast<Function>(V);